I did. They turned out okay. The problem that I had is that when I made my appoinment, I couldn't get in for 2 months. They were that busy. So, when I went in, my daughter was a little too big and their was not enough fluid left in there. I got them a month before she was born. The lady explained that the bigger they are and the less fluid there is, the harder it is to see. In the video/pictures, you can definitely see her facial features, but had she not been as old, they would've turned out better.
So, my moral of the story; if you want them done, call when your child is about 16 weeks along. They told me that the best time is when the fetud is around 24 weeks or so.

Congrats on your new son! No, when I was pregnant, the 3D ultrasound did not yet exist. If it had, I would have gotten one as it had taken me 9 years to get pregnant and we were so excited about it. In fact, ultrasounds couldn't even be done as early then...had my first one when I hemorrhaged...at 28 weeks!